Electrical energy storage module and spacer used for the same

Abstract

An electrical energy storage module disclosed herein includes a first electrical energy storage device and a second electrical energy storage device, and a spacer. The spacer includes a base part and a plurality of tubular protrusion parts. The tubular protrusion part includes a peripheral wall part and a hollow part surrounded by the peripheral wall part. The peripheral wall part includes a first part and a second part. The hollow part is provided with deviation to one side from a center of the tubular protrusion parts in a plan view. When a predetermined load is applied from an arrangement direction, the first part of the peripheral wall part is compressed and deformed and the second part of the peripheral wall part is buckled.

What is claimed is: 
     
         1 . An electrical energy storage module comprising:
 a first electrical energy storage device and a second electrical energy storage device that are disposed along an arrangement direction;   a spacer that is disposed between the first electrical energy storage device and the second electrical energy storage device; and   a restriction mechanism that restricts the first electrical energy storage device, the second electrical energy storage device, and the spacer in the arrangement direction, wherein   the spacer includes a base part with a flat plate shape, and a plurality of tubular protrusion parts projecting from the base part to a side of the first electrical energy storage device,   each of the plurality of tubular protrusion parts includes a peripheral wall part extending to the side of the first electrical energy storage device, and a hollow part surrounded by the peripheral wall part,   the peripheral wall part includes a first part with relatively large thickness and a second part with relatively small thickness,   the hollow part is provided with deviation to one side from a center of the tubular protrusion part in a plan view, and   when a predetermined load is applied from the arrangement direction, the first part of the peripheral wall part is compressed and deformed and the second part of the peripheral wall part is buckled.   
     
     
         2 . The electrical energy storage module according to  claim 1 , wherein each of the plurality of tubular protrusion parts is not rotationally symmetric using the center of the tubular protrusion part as a center of symmetry in the plan view. 
     
     
         3 . The electrical energy storage module according to  claim 1 , wherein the hollow part has a substantially circular shape or a substantially polygonal shape and a center of the hollow part is displaced from the center of the tubular protrusion part in the plan view. 
     
     
         4 . The electrical energy storage module according to  claim 1 , wherein when the tubular protrusion part is divided into two regions along an axial line passing the center of the tubular protrusion part in the plan view, the hollow part is provided only in one region. 
     
     
         5 . The electrical energy storage module according to  claim 1 , wherein out of two of the tubular protrusion parts that are adjacent to each other in a first direction intersecting with the arrangement direction, a first one of the tubular protrusion parts has the hollow part provided with deviation to one side in a second direction intersecting with the first direction and a second one of the tubular protrusion parts has the hollow part provided with deviation to the other side in the second direction. 
     
     
         6 . A spacer for an electrical energy storage module, the spacer being disposed between a first electrical energy storage device and a second electrical energy storage device that are disposed along an arrangement direction, and comprising:
 a base part with a flat plate shape, and a plurality of tubular protrusion parts projecting from the base part to a side of the first electrical energy storage device, wherein   each of the plurality of tubular protrusion parts includes a peripheral wall part extending to the side of the first electrical energy storage device, and a hollow part surrounded by the peripheral wall part,   the peripheral wall part includes a first part with relatively large thickness and a second part with relatively small thickness,   the hollow part is provided with deviation to one side from a center of the tubular protrusion part in a plan view, and   when a predetermined load is applied from the arrangement direction, the first part of the peripheral wall part is compressed and deformed and the second part of the peripheral wall part is buckled.